Your next mission will be to clear Fort Strong of the Super Mutant infestation, as well as retrieve a few Mini-Nukes from inside the base.

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Since you most likely have not traveled to the fort yet, fast travel to the Boston Airport and start walking along the coast as you make your way into the peninsula. Alternatively, use Power Armor to walk along the bed of the bay to directly walk to the fort.

Once there, the Super Mutants will attack. Use the broken down buildings to take cover, and once too many group together and get close, just run over to the next building for cover. There is suit of Power Armor in a shack just before the fort. Grab it before you engage!

Not in the mood to take down the Super Mutants on your own? Before you leave for Fort Strong, enter the Vertibird and attack from above.

Once inside the fort, you'll encounter another round of Super Mutants. Once they are all defeated, take the elevator down to the basement. Clear the Super Mutants here as well. Grab the Mini Nukes and talk to Paladin Danse. From there, return to the Prydwen and talk to Elder Maxson to get the Vertibird Signal Grenade. This will also end the mission!